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Improvement of Low-Alloy Pipe Steel Sulfide Stress Cracking Resistance

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The influence of sheet microstructure formed by various thermomechanical processing schedules on sulfide stress cracking (SSC) resistance under uniaxial tension for low-alloy pipe steels grades X42–X65 is studied. A favorable role is established for substitution of a ferritic-pearlitic by a ferritic-bainitic microstructure and improvement of structural component dispersion is established. The favorable effect is facilitated by using high intensity post-deformation cooling from the austenite region. It is shown that segregation bands and non-metallic inclusions in a sheet axial zone do not affect the duration of specimens withstanding SSC, but they can lead to formation of hydrogen cracks (HIC) on a specimen surface that is a defective feature. In order to prevent crack formation in a specimen surface and premature failure it is necessary to lay down high specifications for specimen gauge length and fillet surface quality.

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Work was conducted with partial financial support of a RFFI grant No. 19-08-00306-a.

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Correspondence to A. A. Kholodnyi.

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Translated from Metallurg, Vol. 63, No. 4, pp. 58–65, April, 2019.

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Kholodnyi, A.A., Kuznechenko, Y.S., Matrosov, Y.I. et al. Improvement of Low-Alloy Pipe Steel Sulfide Stress Cracking Resistance. Metallurgist 63, 376–387 (2019). https://doi.org/10.1007/s11015-019-00833-8

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  • DOI: https://doi.org/10.1007/s11015-019-00833-8

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